Flexi does not generate audio alerts (beeps for errors or prompts) on its own — it uses the sounds provided by the operating system. Volume and tone are therefore configured outside the application.
Where to change the sounds
Windows — Settings → System → Sound, or alternatively Control Panel → Sound → Sounds tab, where you can assign a different sound to system events or turn them off.
macOS — System Settings → Sound, the Sound Effects item.
Linux — sound settings depend on the desktop environment you use (GNOME, KDE).
ℹ️ Manage these settings directly on your PC, as they are settings of your operating system (not of Flexi or the server it runs on).